/**
 * Copyright 2018-2028 Akaxin Group
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.windchat.im.storage;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.sql.SQLException;
import java.util.Properties;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.windchat.im.storage.dao.config.DBConfig;
import com.windchat.im.storage.dao.config.DBType;
import com.windchat.im.storage.dao.config.JdbcConst;
import com.windchat.im.storage.dao.config.PrepareSiteConfigData;
import com.windchat.im.storage.dao.mysql.manager.MysqlManager;
import com.windchat.im.storage.dao.sqlite.manager.SQLiteJDBCManager;
import com.windchat.im.storage.dao.sqlite.manager.SQLiteUpgrade;
import com.windchat.im.storage.exception.InitDatabaseException;
import com.windchat.im.storage.exception.MigrateDatabaseException;
import com.windchat.im.storage.exception.NeedInitMysqlException;
import com.windchat.im.storage.exception.UpgradeDatabaseException;
import com.windchat.im.storage.util.FileUtils;
import com.windchat.im.storage.util.MigrateUtils;

/**
 * 数据源初始化管理，不做具体操作对外提供方法
 *
 * @author Sam{@link an.guoyue254@gmail.com}
 * @since 2018-01-31 12:15:15
 */
public class DataSourceManager {
    private static final Logger logger = LoggerFactory.getLogger(DataSourceManager.class);

    private static final String WINDCHAT_DATABASE_CONFIG = "windchat-server.config";

    private DataSourceManager() {
    }

    // server启动，初始化数据库
    public static void init(DBConfig config)
            throws InitDatabaseException, UpgradeDatabaseException, NeedInitMysqlException {
        try {
            DBType dbType = DBType.PERSONAL;
            Properties pro = loadDatabaseConfig(WINDCHAT_DATABASE_CONFIG);
            if (pro != null && pro.size() > 0) {
                // get edition from config file
                String edition = MysqlManager.trimToNull(pro, JdbcConst.WINDCHAT_EDITION);
                if (StringUtils.isNotEmpty(edition)) {
                    dbType = DBType.getDBType(edition);
                }
            }
            config.setDb(dbType);
            logger.info("load database config finish databaseType:{}", dbType);

            switch (dbType) {
                case PERSONAL:
                    System.setProperty("database", dbType.getName());
                    SQLiteJDBCManager.initSqliteDB(config);
                    PrepareSiteConfigData.init(config);// 初始化数据库中初始数据
                    break;
                case TEAM:
                    System.setProperty("database", dbType.getName());
                    MysqlManager.initMysqlDB(pro); // 初始化数据库以及数据库连接
                    PrepareSiteConfigData.init(config);// 初始化数据库中初始数据
                    break;
            }
        } catch (SQLException e) {
            throw new InitDatabaseException("init database error", e);
        }
    }

    // 初始化，生成mysql的配置文件
    public static void initMysqlConfig() throws FileNotFoundException, IOException {
        // 生成配置文件
        File configFile = new File(WINDCHAT_DATABASE_CONFIG);
        if (!configFile.exists()) {
            FileUtils.writeResourceToFile("/" + WINDCHAT_DATABASE_CONFIG, configFile);
        }
    }

    // 手动升级数据库
    public static int upgradeDB(DBConfig config) throws UpgradeDatabaseException {
        try {
            switch (config.getDb()) {
                case PERSONAL:
                    return SQLiteUpgrade.doUpgrade(config, true);
                case TEAM:
                    throw new UpgradeDatabaseException("database upgrade can't support mysql");
            }
        } catch (SQLException e) {
            throw new UpgradeDatabaseException("upgrade database error", e);
        }
        return 0;
    }

    // 迁移数据库，把sqlite迁移至mysql数据库
    public static void migrateDB() throws MigrateDatabaseException, NeedInitMysqlException {
        // 加载配置文件中的数据库配置
        Properties prop = loadDatabaseConfig(WINDCHAT_DATABASE_CONFIG);
        MigrateUtils.sqlite2Mysql(prop);
    }

    public static Properties loadDatabaseConfig(String configPath) {
        Properties properties = null;
        InputStream inputStream = null;
        try {
            properties = new Properties();
            inputStream = new FileInputStream(configPath);
            properties.load(inputStream);
        } catch (Exception e) {
            logger.error("load database config fail,WindChat will use sqlite database,cause={}", e.getMessage());
        } finally {
            try {
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (IOException e) {
                logger.error("close db config inputstream error", e);
            }
        }
        return properties;
    }

}
